Maintenance - Hitachi CH55EPA (S) Owner's Manual

15m
SAFE OPERATION
CAUTION!
Always wear gloves during operation or

maintenance.

Review the area to be trimmed. Look for
hazards that could contribute to unsafe
conditions. DO NOT operate unit if any wires
(power, telephone, cable, etc.) are closer than
15M (50ft.) to any part of the operator or unit.
(Fig. 2-9)
Spectator and fellow workers must be warned,
and children and animals prevented from
coming nearer than 15M (50ft.) while the pole
saw is in use. (Fig. 2-10)
Avoid all power lines. This unit is not insulated
against electrical current.
Always wear head protection with full face
shield to help protect against falling branches
and debris. (Fig. 2-10)
WARNING!
During operation, hold the unit firmly with
both hands. A single hand operation may
cause serious injury.
Adjustment of blade angle (Fig. 2-11,12)
WARNING!
Always stop engine before making
adjustments.
Never touch the blade when adjusting blade
angle. Hold the support handle (3) instead.
1. Stop the engine.
2. Loosen handle knob (1) slightly so that the
support handle (3) slides.
3. Adjust the blade angle to desired position by
holding the support handle (3).
4. Then, finger-tighten the handle knob (1)
securely.
15m
(50ft.)
Fig.2-9
T
Fig.2-12
Trimming techniques
This unit is designed for trimming hedges and
small branches. Follow these tips for
successful operation.
Plan cut carefully. Check direction branch will
fall.
Long branches should be trimmed in several
pieces.
Do not stand directly beneath branch being cut.
Apply a light cutting pressure.
Ease cutting pressure when nearing end of cut
to maintain control.
5. Maintenance
MAINTENANCE, REPLACEMENT, OR REPAIR
OF THE EMISSION CONTROL DEVICES AND
SYSTEMS MAY BE PERFORMED BY ANY
NON-ROAD ENGINE REPAIR
ESTABLISHMENT OR INDIVIDUAL.
Carburetor adjustment (Fig. 3-1)
WARNING!
The cutting attachment may be spinning
during carburetor adjustments.
WARNING!
Never start the engine without the complete
clutch cover and tube assembled! Otherwise
the clutch can come loose and cause
personal injuries.
In the carburetor, fuel is mixed with air. When the
engine is test run at the factory, the carburetor is
basically adjusted. A further adjustment may be
required, according to climate and altitude. The
carburetor has one adjustment possibility:
T = Idle speed adjustment screw.
3
Fig.2-10
Idle speed adjustment (T)
Check that the air filter is clean. When the idle
speed is correct, the cutting attachment will not
rotate. If adjustment is required, close (clockwise)
the T-screw, with the engine running, until the
cutting attachment starts to rotate. Open (counter-
clockwise) the screw until the cutting attachment
stops. You have reached the correct idle speed
when the engine runs smoothly in all positions
well below the rpm when the cutting attachment
starts to rotate.
If the cutting attachment still rotates after idle
speed adjustment, contact HITACHI dealer.
NOTE!
Standard Idle rpm is 2500~3000 rpm.
NOTE!
Some models sold areas with strict exhaust
emission regulation do not have high and low
speed carburetor adjustments. Such
adjustments may allow the engine to be
operated outside of their emission compliance
limits. For these models, the only carburetor
adjustment is idle speed.
WARNING!
When the engine is idling the cutting
attachment must under no circumstances
rotate.
1
Fig.2-11
T
Fig. 3-1
GB-9